| Answer | Crossword Clue |
|---|---|
| ecotone | a type of ecological zone |
| ecotones | ECOTONE, a type of ecological zone |
| ecotonal | pertaining to an ecotone (a type of ecological zone) |
| subsere | a type of ecological succession |
| subseres | SUBSERE, a type of ecological succession |
| biome | a major ecological community type (as tropical rain forest, grassland, or desert) |
